Synergistic Action of Virgin Coconut Oil and Clomiphene in Reversing Endocrine Dysregulation in Letrozole-Model of Polycystic Ovarian Syndrome in Rats: Role of Nrf2/HMOX-1 Pathway.

Polycystic ovarian syndrome (PCOS) is an endocrine disorder in women's reproductive age. Currently, the pathophysiology of PCOS is unclear, and the limited treatment options are unsatisfactory. Virgin coconut oil (VCO) is functional food oil associated with pharmacological effects in reproductive disorders. Therefore, we aimed to evaluate whether VCO could enhance clomiphene (CLO) therapy against PCOS in female rats. Rats were randomly divided: (1) Control, (2) PCOS model, (3) PCOS + CLO, (4) PCOS + VCO, and (5) PCOS + CLO + VCO. The PCOS was induced via daily letrozole (1 mg/kg, orally) administration for 21 days. After the PCOS induction, CLO, VCO, and CLO + VCO were administered from days 22 to 36. Serum levels of gonadotropin-releasing hormone (GnRH), follicle-stimulating hormone (FSH), luteinizing hormone (LH), testosterone, estrogen, progesterone, and prolactin were estimated. Polymerase chain reaction gene expression for nuclear factor-erythroid-related factor 2 (Nrf2), heme oxygenase-1 (HO-1), catalase (CAT), glutathione reductase (GSR), LH receptor (LHr), androgen receptor (AR), tumor necrosis factor-alpha (TNF-α), interleukin-1ß (IL-1ß), and caspase-3 were analyzed. The letrozole-induced PCOS caused considerable increases in GnRH, LH, prolactin, estrogen, and testosterone, whereas FSH decreased significantly compared to the control. The gene expression of Nrf2, HO-1, CAT, and GSR were markedly diminished, while IL-1ß, TNF-α, caspase-3, AR, and LHr prominently increased compared to control. Interestingly, the CLO and VCO separately exerted anti-inflammatory and endocrine balance effects. However, VCO-enhanced CLO effect in LH, prolactin and testosterone, Nrf2, HO-1, CAT, GSR, and AR. VCO may synergize with CLO to depress hyperandrogenism and oxidative inflammation in PCOS.

Cytotoxic Activity of Herbal Medicines as Assessed in Vitro: A Review.

Since time immemorial, human beings have sought natural medications for treatment of various diseases. Weighty evidence demonstrates the use of chemical methodologies for sensitive evaluation of cytotoxic potentials of herbal agents. However, due to the ubiquitous use of cytotoxicity methods, there is a need for providing updated guidance for the design and development of in vitro assessment. The aim of this review is to provide practical guidance on common cell-based assays for suitable assessment of cytotoxicity potential of herbal medicines and discussing their advantages and disadvantages Relevant articles in authentic databases, including PubMed, Web of Science, Science Direct, Scopus, Google Scholar and SID, from 1950 to 2022 were collected according to selection criteria of in vitro cytotoxicity assays and protocols. In addition, the link between cytotoxicity assay selection and different factors such as the drug solvent, concentration and exposure duration were discussed.

Downregulation of redox imbalance and iNOS/NF-ĸB/caspase-3 signalling with zinc supplementation prevents urotoxicity of cyclophosphamide-induced hemorrhagic cystitis in rats.

AIM: Cyclophosphamide (CYP) chemotherapy induces bladder toxicity and hemorrhagic cystitis in cancer patients constituting a current clinical concern. Oxidative inflammatory cascades have been implicated as the mechanism contributing to CYP bladder urotoxicity. We thus assayed to explore whether zinc (Zn) supplementation could mitigate CYP-induced urotoxicity and evaluate the possible underlying mechanism in rats. MAIN METHOD: Rats were orally administered Zn (100 mg/kg b.w./day) for 10 days against urotoxicity induced by single injection of CYP (150 mg/kg b.w., ip) on day 7. KEY FINDINGS: CYP significantly depressed bladder activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and reduced glutathione (GSH) levels, whereas malondialdehyde level was increased prominently. In addition, CYP induced marked increases in the levels of tumor necrosis factor-α (TNF-α), interleukin-1ß (IL-1ß), interleukin-6 (IL-6), and nitric oxide (NO) confirmed by histological alterations. CYP prominently increased bladder inducible nitric oxide synthase (iNOS) activity, nuclear factor-kappa B (NF-ĸB) and expression of caspase-3 protein. Zinc supplementation considerably abrogated the bladder urotoxicity by restoring redox balance, proinflammatory and apoptotic cascades and alleviated histopathological changes. SIGNIFICANCE: This is the first to reveal zinc potential to prevent CYP-induced urotoxic hemorrhagic cystitis via restoring redox balance and enhancing anti-inflammatory and antiapoptotic mechanisms in rat bladder.

Tiliacora triandra extract and its major constituent attenuates diabetic kidney and testicular impairment by modulating redox imbalance and pro-inflammatory responses in rats.

BACKGROUND: Literature has demonstrated that diabetes is associated with renal complication and testicular dysfunctions. The current study explored the potential of Tiliacora triandra extract and its major component against diabetic kidney and testicular damages in rats. METHODS: Diabetes was induced by high fat diet/streptozotocin (HFD/STZ) and treated orally with Tiliacora triandra extract (TTE, 100 and 400 mg kg-1 body weight) and its major component, 5,7-dihydroxy-6-oxoheptadecanoic acid (DHA, 25 mg kg-1 body weight) for 30 consecutive days. Testicular activities of testicular enzymes, serum levels of testosterone, luteinizing hormone (LH) and follicle-stimulating hormone (FSH), sperm parameters and urinalysis for protein and albumin levels were evaluated. Renal and testicular biomarkers of oxidative stress and pro-inflammation were analysed along with histology. RESULTS: The experimental diabetes induced significant alterations in the levels and activities of indices evaluated compared to non-diabetic normal rats. The 28-day treatment of diabetic rats with TTE and DHA markedly improved activities of testicular enzymes, restored levels of testosterone, LH and FSH and sperm parameters compared to untreated diabetic rats. TTE and DHA abrogated proteinuria and reversed urine albumin level. Testicular and renal oxidative stress and pro-inflammation were attenuated in diabetic rats treated with TTE and DHA. The diabetes-mediated histopathological damage was alleviated in the kidney and testis. CONCLUSION: The protective effect of TTE and DHA against diabetes induced kidney and testicular damages may be related to its antioxidant and anti-inflammatory activities. © 2020 Society of Chemical Industry.

Zinc abrogates anticancer drug tamoxifen-induced hepatotoxicity by suppressing redox imbalance, NO/iNOS/NF-ĸB signaling, and caspase-3-dependent apoptosis in female rats.

Tamoxifen (TAM) is used in breast cancer chemotherapy since its approval by the Food and Drug Administration in 1977. However, TAM therapy is accompanied with hepatotoxicity - a source of worry to clinicians. Oxidative stress and inflammation are the major implicated mechanisms contributing to TAM hepatotoxicity. In this study, we explored whether zinc (Zn) supplementation could prevent TAM-induced hepatotoxicity in female Wistar rats. Rats were subjected to oral pretreatment of Zn (100 mg/kg body weight (b.w.)/day) for 14 days against hepatic toxicity induced by single intraperitoneal administration of TAM (50 mg/kg b.w.) on day 13. TAM markedly elevated serum liver enzymes, whereas total protein and albumin considerably reduced. TAM caused prominent depletion of hepatic-reduced glutathione (GSH), superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) activity. Also, TAM significantly increased malondialdehyde (MDA) level. Further, it raised liver levels of tumor necrosis factor-α (TNF-α), interleukin-1ß, (IL-1ß), interleukin-6 (IL-6), and nitric oxide (NO) confirmed by the liver histopathological alterations. The mechanistic inflammatory expression of inducible nitric oxide synthase (iNOS) and nuclear factor-kappa B (NF-ĸB), and expression of caspase-3 protein prominently increased. Zinc supplementation significantly modulated serum liver function markers, antioxidant enzymes, and GSH and MDA levels. Zinc downregulated the expression of cytokines, NO, iNOS, NF-ĸB and caspase-3, and ameliorated histopathological changes. Zinc protects against TAM-induced hepatotoxicity; it may serve as an adjuvant supplement for female patients undergoing TAM chemotherapy.

Nephroprotective Effect of Moringa Oleifera Seed Oil on Gentamicin-Induced Nephrotoxicity in Rats: Biochemical Evaluation of Antioxidant, Anti-inflammatory, and Antiapoptotic Pathways.

Objective: Gentamicin is an efficacious aminoglycoside antibiotic widely used to treat life-threatening Gram-negative bacteria infections. However, its specific non-targeted induction of nephrotoxicity is a worrying clinical challenge. The study explored the nephroprotective effect of Moringa oleifera seed oil (MOO) against gentamicin-induced oxidative nephrotoxicity, pro-inflammation, and apoptosis in male Wistar rats.Method: Twenty-four rats divided into 4 groups (n = 6) were administered MOO (5 ml/kg) for 16 days and/or gentamicin (100 mg/kg bw/d, ip) injected from day 11 to day 16. The renal antioxidant enzyme activities reduced glutathione, lipid peroxidation, and serum renal markers. Urea and creatinine levels were estimated. The renal expression of interleukin-1ß (IL-1ß), interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and nitric oxide (NO) were determined. Renal levels of inducible nitric oxide synthase (iNOS), nuclear factor-ĸB (NF-ĸB), and caspase-3 were determined to detect possible mechanism of inflammation and apoptosis with histology.Results: MOO prominently reduced serum creatinine and urea levels with amelioration of histopathological abrasions induced by gentamicin (GM). It significantly depressed oxidative stress through lowering of renal malondialdehyde (MDA) and elevation of renal superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) activities, and reduced glutathione (GSH) level. MOO restored renal content of IL-1ß, IL-6, TNF-α, and NO, coupled with the mechanistic downregulation of NF-ĸB, iNOS, and caspase-3 activities. The histopathological alterations were ameliorated by MOO.Conclusions: MOO possesses marked nephroprotective effect against GM-induced renal damage via modulating oxidative stress, inflammation, and apoptosis in Wistar rats.

Moringa oleifera seed oil or virgin coconut oil supplementation abrogates cerebral neurotoxicity induced by antineoplastic agent methotrexate by suppression of oxidative stress and neuro-inflammation in rats.

Methotrexate (MTX) is an effective antineoplastic drug associated with wide organ toxicity. Accumulating evidence implicates oxidative stress to be a leading underlying mechanism of MTX-induced neurotoxicity. The study explores antioxidant potential of virgin coconut oil (VCO) or Moringa oleifera seed oil (MOO) in MTX-induced oxidative stress-mediated cerebral neurotoxicity and inflammation in rats. Rats treated with VCO or MOO (5 ml/kg bw) for 17 days were administered MTX (20 mg/kg, intraperitoneally) on day 14 only. Cerebral activities of acetylcholinesterase, antioxidant enzymes, lipid peroxidation, reduced glutathione and nitric oxide levels as well as cytokines were evaluated. MTX-induced neurotoxic alterations were significantly abrogated by MOO and VCO supplementation via inhibition of cholinesterase, oxidative stress, and anti-inflammatory mechanisms. VCO and MOO showed comparable antioxidant potentials with the standards in DPPH and FRAP assays. VCO and MOO are promising natural oils for modulating MTX neurotoxicity in cancer patients. PRACTICAL APPLICATIONS: Methotrexate chemotherapy induces neurotoxicity in cancer patients, and this is a source of worry for clinicians. This study reports, for the first time, the beneficial health effects of functional food oils, Moringa oleifera seed oil, and virgin coconut oil against anticancer drug methotrexate-induced cerebral neurotoxicity. Supplementation of these natural oils may be beneficial in the prevention of cerebral neurotoxic side effect in cancer patients undergoing methotrexate chemotherapy.

Abrogation of Hepatic Damage Induced by Anticancer Drug Methotrexate by Zobo (Hibiscus sabdariffa extract) Supplementation via Targeting Oxidative Hepatotoxicity in Rats.

Clinical use of methotrexate (MTX) in cancer chemotherapy is limited due to its side effects, notably associated with increased oxidative stress and hepatotoxicity. Zobo is an aqueous extract of Hibiscus sabdariffa known to contain natural antioxidants. The present study investigated the hepatoprotective effect of zobo drink (ZD) on MTX-induced oxidative stress and hepatotoxicity in rats. Rats randomized to control group received distilled water orally; MTX group received intraperitoneal (ip) injection of MTX (20 mg/kg) on day 11; ZD + MTX group was administered ZD (10 ml/kg) for 14 days and was injected with MTX on day 11. Three days after MTX injection, enzyme markers of liver injury, protein profile, and bilirubin were assessed in serum. Hepatic activities of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) and level of lipid peroxidation were estimated. Histopathological changes were carried out on the liver tissue. MTX induced prominent oxidative hepatotoxicity demonstrated by significant (p < .01) increases in serum liver enzymes and bilirubin, while protein profile was markedly reduced (p < .05). Hepatic activities of SOD, CAT, and GPx considerably decreased, whereas lipid peroxidation increased significantly in the MTX group compared to control. By contrast, ZD administration attenuated and restored the markers of liver injury, hepatic antioxidant enzymes, and lipid peroxidation near to control, while histopathological alterations were ameliorated compared to the MTX group. ZD affords superior protection against MTX-induced oxidative hepatotoxicity via improvement in antioxidant defense systems in rats. ZD could be a potent natural product against hepatotoxicity associated with MTX chemotherapy in cancer patients.

Dietary Supplementation with Virgin Coconut Oil Improves Lipid Profile and Hepatic Antioxidant Status and Has Potential Benefits on Cardiovascular Risk Indices in Normal Rats.

Research findings that suggest beneficial health effects of dietary supplementation with virgin coconut oil (VCO) are limited in the published literature. This study investigated the in vivo effects of a 5-week VCO-supplemented diet on lipid profile, hepatic antioxidant status, hepatorenal function, and cardiovascular risk indices in normal rats. Rats were randomly divided into 3 groups: 1 control and 2 treatment groups (10% and 15% VCO-supplemented diets) for 5 weeks. Serum and homogenate samples were used to analyze lipid profile, hepatorenal function markers, hepatic activities of antioxidant enzymes, and malondialdehyde level. Lipid profile of animals fed VCO diets showed significant reduction in total cholesterol (TC), triglyceride (TG), and low-density lipoprotein (LDL) levels; high-density lipoprotein (HDL) level increased significantly (p < .05) compared to control; and there were beneficial effects on cardiovascular risk indices. The level of malondialdehyde (MDA), a lipid peroxidation marker, remarkably reduced and activities of hepatic antioxidant enzymes-superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx)-were markedly increased in VCO diet-fed rats. The VCO diet significantly modulated creatinine, sodium (Na+), potassium (K+), chloride (Cl-), alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP) compared to control. The findings suggest a beneficial effect of VCO on lipid profile, renal status, hepatic antioxidant defense system, and cardiovascular risk indices in rats.

Repeatedly heated palm kernel oil induces hyperlipidemia, atherogenic indices and hepatorenal toxicity in rats: Beneficial role of virgin coconut oil supplementation.

BACKGROUND: The literature reports that the health benefits of vegetable oil can be deteriorated by repeated heating, which leads to lipid oxidation and the formation of free radicals. Virgin coconut oil (VCO) is emerging as a functional food oil and its health benefits are attributed to its potent polyphenolic compounds. We investigated the beneficial effect of VCO supplementation on lipid profile, liver and kidney markers in rats fed repeatedly heated palm kernel oil (HPO). METHODS: Rats were divided into four groups (n = 5). The control group rats were fed with   a normal diet; group 2 rats were fed a 10% VCO supplemented diet; group 3 administered 10 ml HPO/kg b.w. orally; group 4 were fed 10% VCO + 10 ml HPO/kg for 28 days. Subsequently, serum markers of liver damage (ALT, AST, ALP and albumin), kidney damage (urea, creatinine and uric acid), lipid profile and lipid ratios as cardiovascular risk indices were evaluated. RESULTS: HPO induced a significant increase in serum markers of liver and kidney damage as well as con- comitant lipid abnormalities and a marked reduction in serum HDL-C. The lipid ratios evaluated for atherogenic and coronary risk indices in rats administered HPO only were remarkably higher than control. It was observed that VCO supplementation attenuated the biochemical alterations, including the indices of cardiovascular risks. CONCLUSIONS: VCO supplementation demonstrates beneficial health effects against HPO-induced biochemical alterations in rats. VCO may serve to modulate the adverse effects associated with consumption of repeatedly heated palm kernel oil.

Antioxidant and anti-inflammatory effects of virgin coconut oil supplementation abrogate acute chemotherapy oxidative nephrotoxicity induced by anticancer drug methotrexate in rats.

BACKGROUND: Methotrexate (MTX) is an efficacious anticancer agent constrained in clinical use due to its toxicity on non-targeted tissue, a considerable source of worry to clinicians. Because the toxicity is associated with oxidative stress and inflammation, the study explored antioxidant and anti-inflammatory effect of virgin coconut oil (VCO) supplementation in nephrotoxicity induced by MTX in rats. METHODS: Rats were randomized into 4 groups (n=6) as follows: Control group; MTX group injected with single dose of MTX (20mg/kg, ip) on day 14; VCO (5%)+MTX and VCO (15%)+MTX groups were pre-treated with VCO diet and injected with single dose of MTX (20mg/kg, ip) on day 14. After 3 days of MTX injection, serum kidney markers, renal activities of antioxidant enzymes and glutathione (GSH) content were determined. Lipid peroxidation level and inflammatory markers- interleukin-6 (IL-6), nitric oxide (NO) and C-reactive protein (CRP) were estimated in kidney. Histopathological alterations were examined for kidney damage. RESULTS: MTX nephrotoxicity was evidenced by markedly elevated serum renal markers along with significant decreases in renal GSH and activities of antioxidant enzymes confirmed by histopathology. Lipid peroxidation level, IL-6, NO and CRP markedly increased compared to control. VCO supplementation prior to MTX injection attenuated MTX-induced oxidative nephrotoxicity via prominent increases in GSH and antioxidant enzyme activities in a dose-dependent manner. The renal inflammatory markers and MDA depleted considerably compared to MTX control group. Histopathological alterations were mitigated to confirm the biochemical indices. CONCLUSION: VCO supplementation demonstrates nephroprotective activity by attenuating MTX oxidative nephrotoxicity via antioxidant and anti-inflammatory activities in kidney. Our results suggested that VCO may benefit cancer patients on MTX chemotherapy against kidney injury.

Virgin coconut oil supplementation attenuates acute chemotherapy hepatotoxicity induced by anticancer drug methotrexate via inhibition of oxidative stress in rats.

BACKGROUND: The emerging health benefit of virgin coconut oil (VCO) has been associated with its potent natural antioxidants; however, the antioxidant and hepatoprotective effect of VCO against methotrexate-induced liver damage and oxidative stress remains unexplored. The study explored the antioxidant and hepatoprotective effects of VCO against oxidative stress and liver damage induced by anticancer drug methotrexate (MTX) in rats. METHODS: Liver damage was induced in Wistar rats pretreated with dietary supplementation of VCO (5% and 15%) by intraperitoneal administration of MTX (20mg/kg bw) on day 10 only. After 12days of treatment, assays for serum liver biomarkers (aminotransferases), alkaline phosphatase, albumin and total protein as well as hepatic content of malondialdehyde, reduced glutathione and antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase) were carried out. Liver was used to examine histopathological changes. RESULTS: MTX administration induced significant increase in serum liver enzymes along with marked decrease in albumin and total protein compared to control group. Hepatic activities of antioxidant enzymes were significantly decreased, while malondialdehyde increased significantly. Treatment with VCO supplemented diet prior to MTX administration attenuated MTX-induced liver injury and oxidative stress evidenced by significant improvements in serum liver markers, hepatic antioxidant enzymes and malondialdehyde comparable to control group. Histopathological alterations were prevented and correlated well with the biochemical indices. CONCLUSION: The study suggests antioxidant and hepatoprotective effects of VCO supplementation against hepatotoxicity and oxidative damage via improving antioxidant defense system in rats. Our findings may have beneficial application in the management of hepatotoxicity associated with MTX cancer chemotherapy.